Y56 LF: The power of procedures with variables

• Start a new project in LOGO
• Copy this code (copy and paste)

reset
setpensize 5

to rect :h :w :x :y
pu setxy :x :y pd
repeat 2 [fd :h rt 90 fd :w rt 90]
end

• Now you can draw any size rectangle anywhere on the page by typing:
  • rect 30 60 100 -50
• The first two numbers and the height and width
• The second two numbers are the x-coordinate and y-coordinate
  • The page goes from
    • -250 to 250 left to right
    • -250 to 250 bottom to top
• MAke a picture out of rectnangles
• ** Add a colour variable to the procedure
• ** Add another variable, eg
  • pensize
  • angle (dn’t forget to change the angle back again)
  • make it a parallelogram (one angle :ang, other angle (180 – :ang)  )

Khan academy drawing activity using JavaScript